CN106928262A - 一种近红外三聚茚基共轭双bodipy类荧光染料及其制备方法 - Google Patents
一种近红外三聚茚基共轭双bodipy类荧光染料及其制备方法 Download PDFInfo
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Abstract
本发明涉及一种近红外三聚茚基共轭双BODIPY类荧光染料及其制备方法,采用BODIPY衍生物与含双醛三聚茚在对甲苯磺酸和哌啶催化作用下发生Knoevenagel缩合反应合成。该制备方法反应步骤简单、反应条件温和、选择性较好。该类荧光染料具有高的摩尔消光系数、良好的溶解性和光稳定性等优异的光物理性能,其最强电子吸收光谱红移至650nm以上,荧光发射波长达到680nm,是非常有应用前景的有机荧光染料。在细胞成像、生物标记或者光电材料等领域应具有良好的潜在应用前景。
Description
技术领域
本发明属于有机化合物合成、功能性荧光染料和精细化工技术领域,具体涉及一种近红外三聚茚基共轭双BODIPY类荧光染料及其制备方法。
背景技术
氟硼二吡咯染料(BODIPY)是由二吡咯亚甲基与三氟化硼络合形成的复合物。BODIPY类荧光染料具有摩尔吸光系数较高、荧光量子产率高、荧光信号对溶剂极性和pH不敏感、荧光光谱峰窄、荧光寿命长、适中的氧化还原电势、可忽略的三重态等优点;而且BODIPY荧光分子母核相对稳定且具有一定化学活性,结构易于修饰,吸收和发射波长可调变至近红外区。基于以上优点,BODIPY类荧光染料越来越受到人们的关注。
近红外吸收和荧光发射染料分子由于在光学成像、肿瘤诊断、红外伪装、非线性光学材料和荧光标识等众多领域显示出巨大的应用前景。在近红外区,染料的发射波长较长,光穿透力强,背景干扰小;尤其是,近红外光在生物组织内的渗透能力强,且对生物体的损害很小。因此,近年来,对BODIPY染料的研究倾向于合成近红外BODIPY染料,并使其能很好地应用于生物分析和生物成像等领域。
目前大多数近红外氟硼二吡咯类染料合成步骤多、难度大、溶解性差,限制了其在生物、环境、医学等领域的进一步应用。三聚茚(truxene)是一个三重对称的稠环芳烃,具有大的刚性共轭结构和较高的光、热稳定性,且是一类结构易修饰的有机光电材料。因此,可通过Knoevenagel缩合反应将5位上带有甲基的BODIPY衍生物与双醛基三聚茚形成共轭双键,合成一类结构新颖、制备方法简单、性能优良的新型近红外三聚茚基双BODIPY类荧光染料。
发明内容
发明目的:针对现有技术中存在的不足,本发明的目的是提供一种近红外三聚茚基共轭双BODIPY类荧光染料。本发明的另一目的是提供一种上述的近红外三聚茚基共轭双BODIPY类荧光染料的制备方法。
技术方案:为了实现上述发明目的,本发明采用的技术方案为:
本发明的一种近红外三聚茚基共轭双BODIPY类荧光染料及其制备方法,其特征在于,其结构通式如下:
一种近红外三聚茚基的双BODIPY荧光染料衍生物的制备方法,步骤如下:
1)在配备有Dean-Stark装置的圆底烧瓶中加入BODIPY衍生物、双醛基三聚茚和对甲苯磺酸,然后溶解于25mL甲苯和2mL哌啶中,混合物加热到回流,直至TCL检测原料反应完全。其中,双醛三聚茚、对甲苯磺酸(PTSA)和BODIPY衍生物的摩尔比为1∶1∶2。
2)将反应物冷至室温,水洗、二氯甲烷萃取,有机层减压蒸馏除去有机溶剂,残留物经硅胶柱层析分离,洗脱离剂为二氯甲烷-石油醚,得到黑绿色固体产物。
具体化学反应式如下:
上述步骤(1)中,双醛三聚茚、对甲苯磺酸与BODIPY衍生物的摩尔比为1∶1∶2。
上述步骤(1)中,加入的甲苯和哌啶的用量分别是25mL和2mL。
上述步骤(1)中,催化剂为对甲苯磺酸和哌啶。
上述步骤(2)中,硅胶柱层析分离洗脱剂为石油醚∶二氯甲烷=1∶1。
本发明的有益效果
与现有技术相比,本发明的一种近红外三聚茚基共轭双BODIPY类荧光染料及其制备方法具有的优点有:(1)制备方法简便易行,不需要多步反应就可得近红外BODIPY类衍生物,对氧气和湿度不敏感,依然具有BODIPY类化合物固有的可加工性和环境稳定性。(2)该类化合物在有机溶剂溶解性好。(3)该荧光染料具有窄的吸收峰和发射峰、高的摩尔吸光系数、优异的荧光量子产率和良好的光稳定性,使得其在荧光标记、激光染料和生物成像等领域具有良好的应用前景。
附图说明
图1是化合物a的紫外-可见吸收光谱图;
图2是化合物a的荧光发射光谱图;
图3是化合物b的紫外-可见吸收光谱图;
图4是化合物b的荧光发射光谱图;
图5是化合物c的紫外-可见吸收光谱图;
图6是化合物c的荧光发射光谱图。
具体实施方式
下面结合具体附图对本发明做进一步的说明。
用1H-NMR、UV-Vis谱表征并证实近红外BODIPY类荧光染料的结构。检测所用仪器为:Bruker ARX600型核磁共振仪(TMS为内标,氘代氯仿为溶剂),岛津UV-3100型紫外-可见分光光度计(扫描范围300~900nm,光路狭缝2nm),荧光光谱用美国Amico Bowman Series2 Luminescence Spectrometer测试。
实施例1
圆底烧瓶中配备有分水器,将1,5,7-四甲基-3-乙烯基噻吩-8-(2,4,6-三甲苯)-BODIPY(120mg,0.26mmol),2,6-二醛基三聚茚(80mg,0.13mmol)和对甲苯磺酸(50mg)溶于25mL甲苯和2mL哌啶,混合物加热回流,TLC跟踪检测原料反应完全,收集溶剂直到蒸干,水洗、用二氯甲烷萃取,合并有机层,减压力除去有机溶剂,残余物经硅胶柱层析分离提纯,洗脱剂为(石油醚/CH2Cl2=1∶1),得到黑绿色固体化合物a(17.4mg,28.9%)。1H NMR:(600MHz,CDCl3)δ8.50-8.39(m,3H),7.86(d,J=24.30Hz,2H),7.79(d,J=12.24Hz,2H),7.62-7.58(m,4H),7.50-7.48(d,1H),7.44-7.34(m,8H),7.27(d,J=5.76Hz,2H),7.07(t,J=9.60Hz,2H),6.98(s,4H),6.71(s,2H),6.60(s,2H),6.02(s,1H),3.10-3.01(m,6H),2.36(s,6H),2.30-2.18(m,6H),2.15(s,12H),1.48(d,J=15.78Hz,12H),0.30-0.23(m,18H);UV-vis:391nm,608nm,663nm(图1);Emission Wavelength:590nm,680nm(图2)。
实施例2
圆底烧瓶中配备有分水器,将1,5,7-四甲基-3-乙烯基苯(4-甲氧基)-8-(2,4,6-三甲苯)-BODIPY(150mg,0.31mmol),2,6-二醛基三聚茚(92mg,0.15mmol)和对甲苯磺酸(50mg)溶于25mL甲苯和2mL哌啶,混合物加热回流,TLC跟踪检测原料反应完全,收集溶剂直到蒸干,水洗、用二氯甲烷萃取,合并有机层,减压力除去有机溶剂,残余物经硅胶柱层析分离提纯,洗脱剂为(石油醚/CH2Cl2=1∶1),得到黑紫色固体化合物b(22.8mg,15.2%)。1HNMR:(600MHz,CDCl3)δ8.44-8.39(m,3H),7.86(d,J=16.20Hz,2H),7.79(d,J=7.8Hz,2H),7.69(d,J=16.24Hz,2H),7.63(d,6H),7.50(d,J=6.6Hz,1H),7.45-7.39(m,4H),7.26(d,J=15.6Hz,2H),6.99-6.95(m,8H),6.70(s,2H),6.64(s,2H),3.83(s,6H),3.11-3.01(m,6H),2.37(s,6H),2.31-2.19(m,6H),2.16(s,12H),1.48(d,J=9.6Hz,12H),0.30-0.24(m,18H);UV-vis:392nm,605nm,659nm(图3);Emission Wavelength:579nm,674nm(图4)。
实施例3
圆底烧瓶中配备有分水器,将1,5,7-四甲基-3-乙烯基苯(4-(1-哌啶))-8-(2,4,6-三甲苯)-BODIPY(155mg,0.28mmol),2,6-二醛基三聚茚(83mg,0.14mmol)和对甲苯磺酸(50mg)溶于25mL甲苯和2mL哌啶,混合物加热回流,TLC跟踪检测原料反应完全,收集溶剂直到蒸干水洗、用二氯甲烷萃取,合并有机层,减压力除去有机溶剂,残余物经硅胶柱层析分离提纯,洗脱剂为(石油醚/CH2Cl2=1∶1),得到黑色固体化合物c(45.0mg,28.0%)。1H NMR:(600MHz,CDCl3)δ8.47-8.41(m,3H),7.80(d,J=18.00Hz,2H),7.81-7.77(m,2H),7.66(t,J=24.00Hz,4H),7.59-7.57(m,4H),7.50(d,J=6.00Hz,1H),7.46-7.39(m,4H),7.27(d,J=18.00Hz,2H),6.99(s,4H),6.96-6.93(m,4H),6.70(d,J=6.00Hz,2H),6.66(s,2H),3.30-3.27(m,8H),3.14-3.03(m,6H),2.37(s,6H),2.34-2.20(m,6H),2.17(s,12H),1.71-1.67(m,8H),1.63-1.59(m,4H),1.49(d,J=12.00Hz,12H),0.32-0.26(m,18H);UV-vis:342nm,612nm,679nm(图5);Emission Wavelength:590nm,735nm(图6)。
Claims (6)
1.一种近红外三聚茚基共轭双BODIPY类荧光染料,其特征在于,其结构通式如下:
2.权利要求1所述一种近红外三聚茚基共轭双BODIPY类荧光染料的制备方法,其特征在于:以双醛基三聚茚和BODIPY衍生物为原料,在对甲苯磺酸和哌啶的催化作用下生成目标产物,步骤如下:
1)在无水条件下,在配备有Dean-Stark装置的圆底烧瓶中加入BODIPY衍生物、双醛基三聚茚和新重结晶对甲苯磺酸,然后用甲苯溶解,并加入少量哌啶,搅拌加热到回流,直至TLC检测反应原料点消失停止反应。其中,双醛基三聚茚、对甲苯磺酸和BODIPY衍生物的摩尔比为1∶1∶2。
2)将反应物冷至室温,水洗、二氯甲烷溶剂萃取,合并有机层、减压蒸馏除去有机溶剂,残留物经硅胶柱层析分离提纯,洗脱剂为石油醚∶二氯甲烷=1∶1,得到黑绿色固体产物。
3.根据权利要求2所述的一种近红外三聚茚基的双BODIPY类荧光染料的制备方法,其特征在于,步骤1)中,反应需要在无水条件。
4.根据权利要求2所述的一种近红外三聚茚基共轭双BODIPY类荧光染料的制备方法,其特征在于,步骤1)中,双醛基三聚茚、对甲苯磺酸和BODIPY衍生物的摩尔比为1∶1∶2。
5.根据权利要求2所述的一种近红外三聚茚基共轭双BODIPY类荧光染料的制备方法,其特征在于,步骤1)中,用对甲苯磺酸和哌啶共同催化缩合而成。
6.根据权利要求2所述的一种近红外三聚茚共轭双BODIPY类荧光染料的制备方法,其特征在于,步骤2)中,经硅胶柱层析分离制得近红外三聚茚基共轭双BODIPY类荧光染料,洗脱剂为石油醚∶二氯甲烷=1∶1。
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